doc [ci skip] #10383

- test/README.md: document luassert `TableFormatLevel`
- CONTRIBUTING.md: absorb parts of the old "Development tips" wiki page

src/nvim/eval.c

@@ -12076,6 +12076,14 @@ static void f_jobresize(typval_T *argvars, typval_T *rettv, FunPtr fptr)
   rettv->vval.v_number = 1;
 }
 
+/// Builds a process argument vector from a VimL object (typval_T).
+///
+/// @param[in]  cmd_tv      VimL object
+/// @param[out] cmd         Returns the command or executable name.
+/// @param[out] executable  Returns `false` if argv[0] is not executable.
+///
+/// @returns Result of `shell_build_argv()` if `cmd_tv` is a String.
+///          Else, string values of `cmd_tv` copied to a (char **) list.
 static char **tv_to_argv(typval_T *cmd_tv, const char **cmd, bool *executable)
 {
   if (cmd_tv->v_type == VAR_STRING) {